(CNSNews.com) -- Four suspects are being held and one other is still at large in connection with the death of a U.S. Border Patrol agent who was shot and killed on Tuesday apparently by bandits near Rio Rico, Arizona, according to astatement from the U.S. Customs and Border Protection (CBP).

The FBI and the Santa Cruz County Sheriff’s Office are leading the investigation into the incident.

Border Patrol Agent Brian A. Terry was shot and killed in the CBP’s Tucson sector, which as CNSNews.com previously reported, is one of the busiest gateways along the southwest border for human and drug smuggling.

“Our thoughts and prayers are with the Terry family for their tragicloss,” said CBP Commissioner Alan Bersin. “Our commitment to AgentTerry and his family is that we will do everything possible to bringto justice those responsible for this despicable act.”

As reported earlier today Janet Napolitano, secretary of the Department of Homeland Security, is going to Arizona on Thursday and Friday to meet with Border Patrol officials about the killing of Agent Terry.

Santa Cruz County Sheriff Tony Estrada told CNSNews.com that the four suspects were apprehended the morning following the shooting, which Estrada said took place around 11 p.m. on Tuesday.

The suspects were arrested near the place of the shooting and are being held by FBI. At least one other suspect is still being pursued, according to the CBP.